Biofilm Eradication Using Water-Soluble Silver(I) Coumarin Complexes.

Area of Science:

• Coordination Chemistry
• Materials Science
• Antimicrobial Research

Background:

• Coumarin acetate complexes of silver(I) show antimicrobial properties.
• Previous analogs lacked water solubility and photostability.
• Methicillin-resistant Staphylococcus aureus (MRSA) biofilms pose a significant clinical challenge.

Purpose of the Study:

• To synthesize and characterize novel water-soluble and photostable silver(I) coumarin acetate complexes.
• To evaluate the efficacy of these new complexes against MRSA biofilms.
• To improve upon the limitations of previously developed coumarin-silver(I) compounds.

Main Methods:

• Synthesis of PEGylated coumarin oxyacetate ligands.
• Formation and characterization of silver(I) complexes using IR, NMR, microanalysis, and mass spectrometry.
• Testing of antimicrobial activity and biofilm eradication against MRSA.

Main Results:

• Successful synthesis of water-soluble and photostable PEGylated silver(I) coumarin acetate complexes.
• Demonstrated ability of the new complexes to eradicate preformed MRSA biofilms.
• Maintained antimicrobial activity against MRSA, Escherichia coli, and Pseudomonas aeruginosa compared to unPEGylated analogs.

Conclusions:

• PEGylation successfully imparts water solubility and photostability to silver(I) coumarin acetate complexes.
• These novel complexes are effective agents for eradicating established MRSA biofilms.
• The developed compounds represent a promising advancement in combating antibiotic-resistant bacterial infections.